diff options
| author | Peter Chen <peter.chen@nxp.com> | 2016-11-08 10:08:24 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-12 11:39:19 +0100 |
| commit | a10a1b797a0fc6b352c69826c5e9cf09e2056250 (patch) | |
| tree | 8f90389de4f84fdc83f43195787a59fe4d05195c | |
| parent | b429e37b80fd6738ce3d1d6450cc5b4f40ac12a4 (diff) | |
usb: gadget: fix request length error for isoc transfer
commit 982555fc26f9d8bcdbd5f9db0378fe0682eb4188 upstream.
For isoc endpoint descriptor, the wMaxPacketSize is not real max packet
size (see Table 9-13. Standard Endpoint Descriptor, USB 2.0 specifcation),
it may contain the number of packet, so the real max packet should be
ep->desc->wMaxPacketSize && 0x7ff.
Cc: Felipe F. Tonello <eu@felipetonello.com>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
Fixes: 16b114a6d797 ("usb: gadget: fix usb_ep_align_maybe
endianness and new usb_ep_aligna")
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | include/linux/usb/gadget.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 8e81f9eb95e4..e4516e9ded0f 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -429,7 +429,9 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev) */ static inline size_t usb_ep_align(struct usb_ep *ep, size_t len) { - return round_up(len, (size_t)le16_to_cpu(ep->desc->wMaxPacketSize)); + int max_packet_size = (size_t)usb_endpoint_maxp(ep->desc) & 0x7ff; + + return round_up(len, max_packet_size); } /** |